Hi Matthew,
On Thu, Feb 16, 2023 at 5:26 AM Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:
On Thu, Feb 16, 2023 at 01:59:44PM +1300, Michael Schmitz wrote:
On 16/02/23 09:09, Matthew Wilcox (Oracle) wrote:
Add set_ptes(), update_mmu_cache_range(), flush_icache_pages() and
flush_dcache_folio(). I'm not entirely certain that the 040/060 case
in __flush_pages_to_ram() is correct.
I'm pretty sure you need to iterate to hit each of the pages - the code as
is will only push cache entries for the first page.
Quoting the 040 UM:
"Both instructions [cinv, cpush] allow operation on a single cache line, all
cache lines in a specific page, or an entire cache, and can select one or
both caches for the operation. For line and page operations, a physical
address in an address register specifies the memory address."
I actually found that! What I didn't find was how to tell if this
cpush insn is the one which is operating on a single cache line,
a single page, or the entire cache.
cpushl (line), cpushp (page), cpusha (all).
Same for cinv.
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
